Vue.component('email-templates', {
    template: `
        <div>
            <h2>Email Templates</h2>
            
            <div class="action-buttons">
                <el-button type="primary" @click="showAddDialog">Create Template</el-button>
            </div>
            
            <!-- Email Templates Table -->
            <el-table :data="templates" style="width: 100%; margin-top: 20px;" v-loading="loading">
                <el-table-column prop="id" label="ID" width="80"></el-table-column>
                <el-table-column prop="templateName" label="Name" width="200"></el-table-column>
                <el-table-column prop="subject" label="Subject" width="250"></el-table-column>
                <el-table-column prop="description" label="Description"></el-table-column>
                <el-table-column label="Actions" width="200">
                    <template slot-scope="scope">
                        <el-button size="mini" @click="handlePreview(scope.row)">Preview</el-button>
                        <el-button size="mini" type="primary" @click="handleEdit(scope.row)">Edit</el-button>
                        <el-button size="mini" type="danger" @click="handleDelete(scope.row)">Delete</el-button>
                    </template>
                </el-table-column>
            </el-table>
            
            <!-- Pagination -->
            <el-pagination
                @size-change="handleSizeChange"
                @current-change="handleCurrentChange"
                :current-page="currentPage"
                :page-sizes="[10, 20, 50, 100]"
                :page-size="pageSize"
                layout="total, sizes, prev, pager, next, jumper"
                :total="total"
                style="margin-top: 20px;">
            </el-pagination>
            
            <!-- Add/Edit Dialog -->
            <el-dialog :title="dialogTitle" :visible.sync="formDialogVisible" width="800px">
                <el-form :model="form" :rules="rules" ref="form" label-width="120px">
                    <el-form-item label="Template Name" prop="templateName">
                        <el-input v-model="form.templateName" placeholder="Enter template name"></el-input>
                    </el-form-item>
                    <el-form-item label="Subject" prop="subject">
                        <el-input v-model="form.subject" placeholder="Enter email subject"></el-input>
                    </el-form-item>
                    <el-form-item label="Description">
                        <el-input v-model="form.description" placeholder="Enter template description"></el-input>
                    </el-form-item>
                    <el-form-item label="Content" prop="content">
                        <el-input v-model="form.content" type="textarea" :rows="10" placeholder="Enter email content (HTML supported)"></el-input>
                        <div class="el-form-item__tip">
                            Use {{variable}} syntax for variables. Example: Hello {{name}}
                        </div>
                    </el-form-item>
                </el-form>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="formDialogVisible = false">Cancel</el-button>
                    <el-button type="primary" @click="submitForm">Save</el-button>
                </span>
            </el-dialog>
            
            <!-- Preview Dialog -->
            <el-dialog title="Template Preview" :visible.sync="previewDialogVisible" width="800px">
                <div v-if="selectedTemplate">
                    <h3>{{ selectedTemplate.templateName }}</h3>
                    <p><strong>Subject:</strong> {{ selectedTemplate.subject }}</p>
                    
                    <div class="template-editor">
                        <h4>Test Variables</h4>
                        <el-form :inline="true">
                            <el-form-item v-for="(value, key) in testVariables" :key="key" :label="key">
                                <el-input v-model="testVariables[key]" @input="applyTestVariables"></el-input>
                            </el-form-item>
                        </el-form>
                    </div>
                    
                    <div class="template-preview">
                        <h4>Preview</h4>
                        <div>
                            <strong>Subject:</strong> {{ previewSubject }}
                        </div>
                        <div class="content-preview" v-html="previewContent"></div>
                    </div>
                </div>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="previewDialogVisible = false">Close</el-button>
                </span>
            </el-dialog>
        </div>
    `,
    data() {
        return {
            templates: [],
            loading: false,
            currentPage: 1,
            pageSize: 10,
            total: 0,
            formDialogVisible: false,
            previewDialogVisible: false,
            dialogTitle: 'Create Email Template',
            isEdit: false,
            form: {
                id: null,
                templateName: '',
                subject: '',
                content: '',
                description: ''
            },
            rules: {
                templateName: [
                    { required: true, message: 'Please enter template name', trigger: 'blur' }
                ],
                subject: [
                    { required: true, message: 'Please enter email subject', trigger: 'blur' }
                ],
                content: [
                    { required: true, message: 'Please enter email content', trigger: 'blur' }
                ]
            },
            selectedTemplate: null,
            testVariables: {},
            previewSubject: '',
            previewContent: ''
        };
    },
    created() {
        this.loadTemplates();
    },
    methods: {
        loadTemplates() {
            this.loading = true;
            axios.get(`/email-templates?page=${this.currentPage}&size=${this.pageSize}`)
                .then(response => {
                    this.templates = response.data.records;
                    this.total = response.data.total;
                    this.loading = false;
                })
                .catch(error => {
                    console.error('Error loading templates:', error);
                    this.$message.error('Failed to load email templates');
                    this.loading = false;
                });
        },
        
        handleSizeChange(size) {
            this.pageSize = size;
            this.loadTemplates();
        },
        
        handleCurrentChange(page) {
            this.currentPage = page;
            this.loadTemplates();
        },
        
        showAddDialog() {
            this.dialogTitle = 'Create Email Template';
            this.isEdit = false;
            this.form = {
                id: null,
                templateName: '',
                subject: '',
                content: '',
                description: ''
            };
            this.formDialogVisible = true;
        },
        
        handleEdit(row) {
            this.dialogTitle = 'Edit Email Template';
            this.isEdit = true;
            this.form = { ...row };
            this.formDialogVisible = true;
        },
        
        handleDelete(row) {
            this.$confirm('Are you sure you want to delete this template?', 'Warning', {
                confirmButtonText: 'Yes',
                cancelButtonText: 'No',
                type: 'warning'
            }).then(() => {
                axios.delete(`/email-templates/${row.id}`)
                    .then(() => {
                        this.$message.success('Template deleted successfully');
                        this.loadTemplates();
                    })
                    .catch(error => {
                        console.error('Error deleting template:', error);
                        this.$message.error('Failed to delete template');
                    });
            }).catch(() => {
                // User cancelled
            });
        },
        
        submitForm() {
            this.$refs.form.validate(valid => {
                if (valid) {
                    if (this.isEdit) {
                        // Update existing template
                        axios.put(`/email-templates/${this.form.id}`, this.form)
                            .then(() => {
                                this.$message.success('Template updated successfully');
                                this.formDialogVisible = false;
                                this.loadTemplates();
                            })
                            .catch(error => {
                                console.error('Error updating template:', error);
                                this.$message.error('Failed to update template');
                            });
                    } else {
                        // Add new template
                        axios.post('/email-templates', this.form)
                            .then(() => {
                                this.$message.success('Template created successfully');
                                this.formDialogVisible = false;
                                this.loadTemplates();
                            })
                            .catch(error => {
                                console.error('Error creating template:', error);
                                this.$message.error('Failed to create template');
                            });
                    }
                }
            });
        },
        
        handlePreview(template) {
            this.selectedTemplate = template;
            this.previewSubject = template.subject;
            this.previewContent = template.content;
            
            // Extract variables from template
            this.testVariables = {};
            const variableRegex = /{{(.*?)}}/g;
            let match;
            
            while ((match = variableRegex.exec(template.subject + template.content)) !== null) {
                const variable = match[1].trim();
                if (!this.testVariables[variable]) {
                    this.testVariables[variable] = variable;
                }
            }
            
            this.previewDialogVisible = true;
        },
        
        applyTestVariables() {
            if (!this.selectedTemplate) return;
            
            let subject = this.selectedTemplate.subject;
            let content = this.selectedTemplate.content;
            
            // Replace variables in subject and content
            for (const [key, value] of Object.entries(this.testVariables)) {
                const regex = new RegExp(`{{${key}}}`, 'g');
                subject = subject.replace(regex, value);
                content = content.replace(regex, value);
            }
            
            this.previewSubject = subject;
            this.previewContent = content;
        }
    }
});
